PROBLEM
Offset, Blocking or Picking of Non Porous Stocks
CAUSE
  • Inadequate drying.
  • Inks remain soft.
  • Excessive pile height.
  • High heat.
  • Too much coating applied.
  • High Humidity.
  • Defective spray powder unit.
SOLUTION
  • Use maximum air knives and extraction.
  • Only use enough heat to set and dry the inks.
  • Maintain ink/water balance.
  • Use specially formulated inks for non-porous stocks.
  • Run smaller lifts.
  • Reduce Viscosity.
  • Slow coater down, increase NIP pressure.
  • Maintain pressroom climate control.
  • Inspect and clean spray unit and run minimal amounts.
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